ITPEC FE Morning April 2020 Question 12
ITPEC FE Morning April 2020 — Question 12 of 80
UART (asynchronous serial transmission) — identify the asynchronous serial protocol.
UART = Universal Asynchronous Receiver/Transmitter — transmits data character-by-character using start/stop bits instead of a shared clock signal.
Why not others:
- (a) I²C — synchronous; uses a dedicated clock line (SCL)
- (b) PCI Express — synchronous; a high-speed expansion bus (GPUs, SSDs)
- (c) SPI — synchronous; uses a clock line (SCLK)
Key rule: Among common serial protocols, UART is the only asynchronous one — the "A" in UART stands for Asynchronous.
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